//
// Copyright (c) 2010 xiaoningyb (xiaoningyb@gmail.com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//

#include <stdexcept>
#include <boost/thread.hpp>
#include <boost/bind.hpp>
#include <boost/shared_ptr.hpp>

#include "sharing_server.h"

namespace tinysharing
{
    io_service_pool::io_service_pool(std::size_t pool_size)
        : next_io_service_(0)
    {
        if (pool_size == 0)
            throw std::runtime_error("io_service_pool size is 0");

        // Give all the io_services work to do so that their run() functions will not
        // exit until they are explicitly stopped.
        for (std::size_t i = 0; i < pool_size; ++i)
        {
            io_service_ptr io_service(new boost::asio::io_service);
            work_ptr work(new boost::asio::io_service::work(*io_service));
            io_services_.push_back(io_service);
            work_.push_back(work);
        }
    }

    void io_service_pool::run()
    {
        // Create a pool of threads to run all of the io_services.
        std::vector<boost::shared_ptr<boost::thread> > threads;
        for (std::size_t i = 0; i < io_services_.size(); ++i)
        {
            boost::shared_ptr<boost::thread>
                thread(new boost::thread(boost::bind(&boost::asio::io_service::run,
                                                     io_services_[i])));
            threads.push_back(thread);
        }

        // Wait for all threads in the pool to exit.
        for (std::size_t i = 0; i < threads.size(); ++i)
            threads[i]->join();
    }

    void io_service_pool::stop()
    {
        // Explicitly stop all io_services.
        for (std::size_t i = 0; i < io_services_.size(); ++i)
            io_services_[i]->stop();
    }

    boost::asio::io_service& io_service_pool::get_io_service()
    {
        // Use a round-robin scheme to choose the next io_service to use.
        boost::asio::io_service& io_service = *io_services_[next_io_service_];
        ++next_io_service_;
        if (next_io_service_ == io_services_.size())
            next_io_service_ = 0;
        return io_service;
    }

} // namespace tinysharing

